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Wavelength Modulation Spectra and Electronic Band Structure of SnS 2 and SnSe 2
Author(s) -
Camassel J.,
Schlüter M.,
Kohn S.,
Voitchovsky J. P.,
Shen Y. R.,
Cohen M. L.
Publication year - 1976
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220750133
Subject(s) - ion , valence (chemistry) , reflectivity , spectral line , wavelength , conduction band , electronic band structure , modulation (music) , chemistry , materials science , molecular physics , condensed matter physics , optics , optoelectronics , physics , electron , quantum mechanics , organic chemistry , acoustics
The first detailed reflectivity and differential reflectivity measurements performed on the layer compounds SnS 2 and SnSe 2 for energies ranging from 2 to 6 eV are presented. The results are discussed on the basis of existing band structure calculations. The main structures in the optical response of SnS 2 and SnSe 2 are found to result from excitations from the top most anion p‐type valence states (crystal field split p z and p xy type levels) into the lowest conduction band (anion and cation s‐ and p‐type levels). The location of these structures in k ‐space is found to be very close to symmetry determined “special k ‐points” for SnS 2 .